Precalculus Examples

$(5 x + 6) (3 x^{2} + \frac{8}{3} x - \frac{2}{5} - \frac{14}{5 x + 6})$

Step 1

Combine $\frac{8}{3}$ and $x$ .

$(5 x + 6) (3 x^{2} + \frac{8 x}{3} - \frac{2}{5} - \frac{14}{5 x + 6})$

Step 2

To write $3 x^{2}$ as a fraction with a common denominator, multiply by $\frac{5 x + 6}{5 x + 6}$ .

$(5 x + 6) (\frac{3 x^{2} (5 x + 6)}{5 x + 6} - \frac{14}{5 x + 6} + \frac{8 x}{3} - \frac{2}{5})$

Step 3

Combine the numerators over the common denominator.

$(5 x + 6) (\frac{3 x^{2} (5 x + 6) - 14}{5 x + 6} + \frac{8 x}{3} - \frac{2}{5})$

Step 4

Simplify the numerator.

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Step 4.1

Apply the distributive property.

$(5 x + 6) (\frac{3 x^{2} (5 x) + 3 x^{2} \cdot 6 - 14}{5 x + 6} + \frac{8 x}{3} - \frac{2}{5})$

Step 4.2

Rewrite using the commutative property of multiplication.

$(5 x + 6) (\frac{3 \cdot 5 x^{2} x + 3 x^{2} \cdot 6 - 14}{5 x + 6} + \frac{8 x}{3} - \frac{2}{5})$

Step 4.3

Multiply $6$ by $3$ .

$(5 x + 6) (\frac{3 \cdot 5 x^{2} x + 18 x^{2} - 14}{5 x + 6} + \frac{8 x}{3} - \frac{2}{5})$

Step 4.4

Simplify each term.

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Step 4.4.1

Multiply $x^{2}$ by $x$ by adding the exponents.

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Step 4.4.1.1

Move $x$ .

$(5 x + 6) (\frac{3 \cdot 5 (x \cdot x^{2}) + 18 x^{2} - 14}{5 x + 6} + \frac{8 x}{3} - \frac{2}{5})$

Step 4.4.1.2

Multiply $x$ by $x^{2}$ .

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Step 4.4.1.2.1

Raise $x$ to the power of $1$ .

$(5 x + 6) (\frac{3 \cdot 5 (x^{1} x^{2}) + 18 x^{2} - 14}{5 x + 6} + \frac{8 x}{3} - \frac{2}{5})$

Step 4.4.1.2.2

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$(5 x + 6) (\frac{3 \cdot 5 x^{1 + 2} + 18 x^{2} - 14}{5 x + 6} + \frac{8 x}{3} - \frac{2}{5})$

Step 4.4.1.3

Add $1$ and $2$ .

$(5 x + 6) (\frac{3 \cdot 5 x^{3} + 18 x^{2} - 14}{5 x + 6} + \frac{8 x}{3} - \frac{2}{5})$

Step 4.4.2

Multiply $3$ by $5$ .

$(5 x + 6) (\frac{15 x^{3} + 18 x^{2} - 14}{5 x + 6} + \frac{8 x}{3} - \frac{2}{5})$

Step 5

To write $\frac{15 x^{3} + 18 x^{2} - 14}{5 x + 6}$ as a fraction with a common denominator, multiply by $\frac{3}{3}$ .

$(5 x + 6) (\frac{15 x^{3} + 18 x^{2} - 14}{5 x + 6} \cdot \frac{3}{3} + \frac{8 x}{3} - \frac{2}{5})$

Step 6

To write $\frac{8 x}{3}$ as a fraction with a common denominator, multiply by $\frac{5 x + 6}{5 x + 6}$ .

$(5 x + 6) (\frac{15 x^{3} + 18 x^{2} - 14}{5 x + 6} \cdot \frac{3}{3} + \frac{8 x}{3} \cdot \frac{5 x + 6}{5 x + 6} - \frac{2}{5})$

Step 7

Write each expression with a common denominator of $(5 x + 6) \cdot 3$ , by multiplying each by an appropriate factor of $1$ .

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Step 7.1

Multiply $\frac{15 x^{3} + 18 x^{2} - 14}{5 x + 6}$ by $\frac{3}{3}$ .

$(5 x + 6) (\frac{(15 x^{3} + 18 x^{2} - 14) \cdot 3}{(5 x + 6) \cdot 3} + \frac{8 x}{3} \cdot \frac{5 x + 6}{5 x + 6} - \frac{2}{5})$

Step 7.2

Multiply $\frac{8 x}{3}$ by $\frac{5 x + 6}{5 x + 6}$ .

$(5 x + 6) (\frac{(15 x^{3} + 18 x^{2} - 14) \cdot 3}{(5 x + 6) \cdot 3} + \frac{8 x (5 x + 6)}{3 (5 x + 6)} - \frac{2}{5})$

Step 7.3

Reorder the factors of $(5 x + 6) \cdot 3$ .

$(5 x + 6) (\frac{(15 x^{3} + 18 x^{2} - 14) \cdot 3}{3 (5 x + 6)} + \frac{8 x (5 x + 6)}{3 (5 x + 6)} - \frac{2}{5})$

Step 8

Combine the numerators over the common denominator.

$(5 x + 6) (\frac{(15 x^{3} + 18 x^{2} - 14) \cdot 3 + 8 x (5 x + 6)}{3 (5 x + 6)} - \frac{2}{5})$

Step 9

Simplify the numerator.

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Step 9.1

Apply the distributive property.

$(5 x + 6) (\frac{15 x^{3} \cdot 3 + 18 x^{2} \cdot 3 - 14 \cdot 3 + 8 x (5 x + 6)}{3 (5 x + 6)} - \frac{2}{5})$

Step 9.2

Simplify.

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Step 9.2.1

Multiply $3$ by $15$ .

$(5 x + 6) (\frac{45 x^{3} + 18 x^{2} \cdot 3 - 14 \cdot 3 + 8 x (5 x + 6)}{3 (5 x + 6)} - \frac{2}{5})$

Step 9.2.2

Multiply $3$ by $18$ .

$(5 x + 6) (\frac{45 x^{3} + 54 x^{2} - 14 \cdot 3 + 8 x (5 x + 6)}{3 (5 x + 6)} - \frac{2}{5})$

Step 9.2.3

Multiply $- 14$ by $3$ .

$(5 x + 6) (\frac{45 x^{3} + 54 x^{2} - 42 + 8 x (5 x + 6)}{3 (5 x + 6)} - \frac{2}{5})$

Step 9.3

Apply the distributive property.

$(5 x + 6) (\frac{45 x^{3} + 54 x^{2} - 42 + 8 x (5 x) + 8 x \cdot 6}{3 (5 x + 6)} - \frac{2}{5})$

Step 9.4

Rewrite using the commutative property of multiplication.

$(5 x + 6) (\frac{45 x^{3} + 54 x^{2} - 42 + 8 \cdot 5 x \cdot x + 8 x \cdot 6}{3 (5 x + 6)} - \frac{2}{5})$

Step 9.5

Multiply $6$ by $8$ .

$(5 x + 6) (\frac{45 x^{3} + 54 x^{2} - 42 + 8 \cdot 5 x \cdot x + 48 x}{3 (5 x + 6)} - \frac{2}{5})$

Step 9.6

Simplify each term.

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Step 9.6.1

Multiply $x$ by $x$ by adding the exponents.

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Step 9.6.1.1

Move $x$ .

$(5 x + 6) (\frac{45 x^{3} + 54 x^{2} - 42 + 8 \cdot 5 (x \cdot x) + 48 x}{3 (5 x + 6)} - \frac{2}{5})$

Step 9.6.1.2

Multiply $x$ by $x$ .

$(5 x + 6) (\frac{45 x^{3} + 54 x^{2} - 42 + 8 \cdot 5 x^{2} + 48 x}{3 (5 x + 6)} - \frac{2}{5})$

Step 9.6.2

Multiply $8$ by $5$ .

$(5 x + 6) (\frac{45 x^{3} + 54 x^{2} - 42 + 40 x^{2} + 48 x}{3 (5 x + 6)} - \frac{2}{5})$

Step 9.7

Add $54 x^{2}$ and $40 x^{2}$ .

$(5 x + 6) (\frac{45 x^{3} + 94 x^{2} - 42 + 48 x}{3 (5 x + 6)} - \frac{2}{5})$

Step 9.8

Reorder terms.

$(5 x + 6) (\frac{45 x^{3} + 94 x^{2} + 48 x - 42}{3 (5 x + 6)} - \frac{2}{5})$

Step 10

To write $\frac{45 x^{3} + 94 x^{2} + 48 x - 42}{3 (5 x + 6)}$ as a fraction with a common denominator, multiply by $\frac{5}{5}$ .

$(5 x + 6) (\frac{45 x^{3} + 94 x^{2} + 48 x - 42}{3 (5 x + 6)} \cdot \frac{5}{5} - \frac{2}{5})$

Step 11

To write $- \frac{2}{5}$ as a fraction with a common denominator, multiply by $\frac{3 (5 x + 6)}{3 (5 x + 6)}$ .

$(5 x + 6) (\frac{45 x^{3} + 94 x^{2} + 48 x - 42}{3 (5 x + 6)} \cdot \frac{5}{5} - \frac{2}{5} \cdot \frac{3 (5 x + 6)}{3 (5 x + 6)})$

Step 12

Write each expression with a common denominator of $15 (5 x + 6)$ , by multiplying each by an appropriate factor of $1$ .

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Step 12.1

Multiply $\frac{45 x^{3} + 94 x^{2} + 48 x - 42}{3 (5 x + 6)}$ by $\frac{5}{5}$ .

$(5 x + 6) (\frac{(45 x^{3} + 94 x^{2} + 48 x - 42) \cdot 5}{3 (5 x + 6) \cdot 5} - \frac{2}{5} \cdot \frac{3 (5 x + 6)}{3 (5 x + 6)})$

Step 12.2

Multiply $5$ by $3$ .

$(5 x + 6) (\frac{(45 x^{3} + 94 x^{2} + 48 x - 42) \cdot 5}{15 (5 x + 6)} - \frac{2}{5} \cdot \frac{3 (5 x + 6)}{3 (5 x + 6)})$

Step 12.3

Multiply $\frac{2}{5}$ by $\frac{3 (5 x + 6)}{3 (5 x + 6)}$ .

$(5 x + 6) (\frac{(45 x^{3} + 94 x^{2} + 48 x - 42) \cdot 5}{15 (5 x + 6)} - \frac{2 (3 (5 x + 6))}{5 (3 (5 x + 6))})$

Step 12.4

Multiply $3$ by $5$ .

$(5 x + 6) (\frac{(45 x^{3} + 94 x^{2} + 48 x - 42) \cdot 5}{15 (5 x + 6)} - \frac{2 (3 (5 x + 6))}{15 (5 x + 6)})$

Step 13

Combine the numerators over the common denominator.

$(5 x + 6) \frac{(45 x^{3} + 94 x^{2} + 48 x - 42) \cdot 5 - 2 (3 (5 x + 6))}{15 (5 x + 6)}$

Step 14

Simplify the numerator.

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Step 14.1

Apply the distributive property.

$(5 x + 6) \frac{45 x^{3} \cdot 5 + 94 x^{2} \cdot 5 + 48 x \cdot 5 - 42 \cdot 5 - 2 (3 (5 x + 6))}{15 (5 x + 6)}$

Step 14.2

Simplify.

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Step 14.2.1

Multiply $5$ by $45$ .

$(5 x + 6) \frac{225 x^{3} + 94 x^{2} \cdot 5 + 48 x \cdot 5 - 42 \cdot 5 - 2 (3 (5 x + 6))}{15 (5 x + 6)}$

Step 14.2.2

Multiply $5$ by $94$ .

$(5 x + 6) \frac{225 x^{3} + 470 x^{2} + 48 x \cdot 5 - 42 \cdot 5 - 2 (3 (5 x + 6))}{15 (5 x + 6)}$

Step 14.2.3

Multiply $5$ by $48$ .

$(5 x + 6) \frac{225 x^{3} + 470 x^{2} + 240 x - 42 \cdot 5 - 2 (3 (5 x + 6))}{15 (5 x + 6)}$

Step 14.2.4

Multiply $- 42$ by $5$ .

$(5 x + 6) \frac{225 x^{3} + 470 x^{2} + 240 x - 210 - 2 (3 (5 x + 6))}{15 (5 x + 6)}$

Step 14.3

Apply the distributive property.

$(5 x + 6) \frac{225 x^{3} + 470 x^{2} + 240 x - 210 - 2 (3 (5 x) + 3 \cdot 6)}{15 (5 x + 6)}$

Step 14.4

Multiply $5$ by $3$ .

$(5 x + 6) \frac{225 x^{3} + 470 x^{2} + 240 x - 210 - 2 (15 x + 3 \cdot 6)}{15 (5 x + 6)}$

Step 14.5

Multiply $3$ by $6$ .

$(5 x + 6) \frac{225 x^{3} + 470 x^{2} + 240 x - 210 - 2 (15 x + 18)}{15 (5 x + 6)}$

Step 14.6

Apply the distributive property.

$(5 x + 6) \frac{225 x^{3} + 470 x^{2} + 240 x - 210 - 2 (15 x) - 2 \cdot 18}{15 (5 x + 6)}$

Step 14.7

Multiply $15$ by $- 2$ .

$(5 x + 6) \frac{225 x^{3} + 470 x^{2} + 240 x - 210 - 30 x - 2 \cdot 18}{15 (5 x + 6)}$

Step 14.8

Multiply $- 2$ by $18$ .

$(5 x + 6) \frac{225 x^{3} + 470 x^{2} + 240 x - 210 - 30 x - 36}{15 (5 x + 6)}$

Step 14.9

Subtract $30 x$ from $240 x$ .

$(5 x + 6) \frac{225 x^{3} + 470 x^{2} + 210 x - 210 - 36}{15 (5 x + 6)}$

Step 14.10

Subtract $36$ from $- 210$ .

$(5 x + 6) \frac{225 x^{3} + 470 x^{2} + 210 x - 246}{15 (5 x + 6)}$

Step 15

Cancel the common factor of $5 x + 6$ .

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Step 15.1

Factor $5 x + 6$ out of $15 (5 x + 6)$ .

$(5 x + 6) \frac{225 x^{3} + 470 x^{2} + 210 x - 246}{(5 x + 6) \cdot 15}$

Step 15.2

Cancel the common factor.

$(5 x + 6) \frac{225 x^{3} + 470 x^{2} + 210 x - 246}{(5 x + 6) \cdot 15}$

Step 15.3

Rewrite the expression.

$\frac{225 x^{3} + 470 x^{2} + 210 x - 246}{15}$